William n



W. N. WHITELEY. Pitman Head and Cran k Wrist Connection.

no. 70,661. Patented Nov. 5, 1867.

nan/551 WILLIAM N. WHITELEY, OF SPRINGFIELD, OHIO.

Letters. atent No. 70,661, dated November 5, 1867.

" IMPROVEMENT IN PITMAN-HBAD AND CRANK-WRIST GONNEGTION.

TO ALL WHOM IT MAY CONCERN: I

Be it known that I, WILLIAM N. WHITELEY, of Springfield, in the county of Clark, and State of Ohio, have invented a new and useful Improvement in Pitman-Head and Crank-Wrist Connection; andIdo hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, in which I v Figure 1 is a perspective view of the pitman-head and box detached from the crank.

Figure 2 is a sectional view of the connection.

Figures 3, 5, 6, 7, 8, exhibit modified constructions of the wrist-pin.

Figures 4 and 4, modified construction of the end of pitman-rod.

My invention consists, first, in the construction of the pitman-head and crank-wrist connection, whereby the advantages of a pivoted or rockingbox and the steadiness of a rigid head are obtained with a solid pitmanhead and stationary box; second, in the form and construction of the wrist-pin and mode of connection with the box.

For convenience this invention is shown as connected to a harvester, though it is equally applicable to other classes of machinery, and may be equally valuable in other positions. I therefore do not desire to be understood as limiting myself to its application to harvesters.

In order that others may understand the construction and operation of my invention, I will proceed to more particularly describe it. i

A is the crank-wheel, to which the wrist-pin Bis secured. This wrist-pin may be either cylindrical or conical, though in this application it is shown as cylindrical, and it may be made tubular, and secured to the crank-wheel by a clamping-bolt, C, as shown in fig. 2, or it may be constructed with a solid shank, inserted through a suitable hole in the wheel, and riveted, as shown in fig. 3. Figs. 5, 6, 7, and 8, exhibit modifications in the construction of the wrist-pin, figs. 5 and 6 being designed for use with a cut-box, and fig. 8 a baILand-socket joint. The wrist-pin, shown in fig. 6, is made hollow, as a receptacle for a fluid lubricator, and a hole, D, is drilled through the wrist intothe cavity for the escape of the enclosed lubricant into the wrist-joint. The orifice through which the lubricant is introduced is closed by the screw E, or by some other suitable means. The motion of the crank will cause the lubricating fluid to flow out through the hole D into the joint in minute quantities, and thus maintain a very perfect lubrication of the joint. The pitman-head F is constructed with two boxes or bearings,

whose axes are at right angles, and crossing each other. Through one of these bearing-boxes the wrist-pin passes, and through the other the end of the pitman-rod G,'properly fitted, is inserted and secured by screwnuts or otherwise. The shank g of the pitman-rod G may be made cylindrical, as shown in fig. 2, or conical, as shown in fig. 4, so that lost motion may be taken up perfectly, as the shank and its box become worn by use.

It is evident that a crank-box at the end of a pitman-head, constructed in this manner, will permit a rotation of the pitman upon its axis, so that the points of the cutters may be raised or lowered without any torsion of the pitman-rod. The length of the shank g passing through a box, as shown, gives perfect steadiness tothe connection between the pitman and pitman-head F, a feature of the highest importance, as the slightest unsteadiness or play between the pitman-rod and the pitman-head will, owing to the violent movementof the parts, cause so much friction as to rapidly wear away the surfaces and disable that part of the machine.

These wrist-pins I manufacture of iron, and, after turning and finishing them, they are packed in boxes in company with charcoal, or other carbonized substances, and submitted to a high degree of heat for a period of time sufiicient to carbonize and convert into steel the entire surface.

By this means I produce a wrist-pin with all the strength of wrought iron, and all the advantages of a hardened steel frictional surface. This eil'ect is shown in fig. 6.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-- 1. The pitman-head box F, constructed with two bearings, whose axes are at right angles to and cross each other, substantially as and for the purpose set forth.

2. In combination with the pitman-head box F, the hollow wrist-pin, fig. 6, provided with the escape-hole D, so as to form a reservoir for a liquid lubricant within the journal, substantially as set forth and described.

' l WILLIAM N. WHITELEY.

Witnesses:

THOMAS J. Parsons,

HENRY B. NAGLEY. 

